2661438140 has 12 divisors (see below), whose sum is σ = 5589020136. Its totient is φ = 1064575248.

The previous prime is 2661438107. The next prime is 2661438181. The reversal of 2661438140 is 418341662.

2661438140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2661438140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66535934 + ... + 66535973.

It is an arithmetic number, because the mean of its divisors is an integer number (465751678).

Almost surely, 2^2661438140 is an apocalyptic number.

2661438140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661438140 is an abundant number, since it is smaller than the sum of its proper divisors (2927581996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661438140 is a wasteful number, since it uses less digits than its factorization.

2661438140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133071916 (or 133071914 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 2661438140 is about 51589.1281182382. The cubic root of 2661438140 is about 1385.8156412409.

The spelling of 2661438140 in words is "two billion, six hundred sixty-one million, four hundred thirty-eight thousand, one hundred forty".